DateTime.TryParseExact(String String IFormatProvider DateTimeStyles DateTime)

使用指定的格式，特定於區域性的格式資訊和樣式將指定的日期和時間字串表示形式轉換為其 DateTime 等效形式。字串表示的格式必須與指定的格式完全匹配。該方法返回一個值，指示轉換是否成功。

例如

CultureInfo enUS = new CultureInfo("en-US");
string dateString;
System.DateTime dateValue;

解析日期沒有樣式標誌。

dateString = " 5/01/2009 8:30 AM";
if (DateTime.TryParseExact(dateString, "g", enUS, DateTimeStyles.None, out dateValue))
{
   Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

// Allow a leading space in the date string.
if(DateTime.TryParseExact(dateString, "g", enUS, DateTimeStyles.AllowLeadingWhite, out dateValue))
{
   Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

使用 M 和 MM 的自定義格式。

dateString = "5/01/2009 09:00";
if(DateTime.TryParseExact(dateString, "M/dd/yyyy hh:mm", enUS, DateTimeStyles.None, out dateValue))
{
    Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

// Allow a leading space in the date string.
if(DateTime.TryParseExact(dateString, "MM/dd/yyyy hh:mm", enUS, DateTimeStyles.None, out dateValue))
{
   Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

使用時區資訊解析字串。

dateString = "05/01/2009 01:30:42 PM -05:00";
if (DateTime.TryParseExact(dateString, "MM/dd/yyyy hh:mm:ss tt zzz", enUS, DateTimeStyles.None, out dateValue))
{
    Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

// Allow a leading space in the date string.
if (DateTime.TryParseExact(dateString, "MM/dd/yyyy hh:mm:ss tt zzz", enUS, DateTimeStyles.AdjustToUniversal, out dateValue))
{
   Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

解析代表 UTC 的字串。

dateString = "2008-06-11T16:11:20.0904778Z";
if(DateTime.TryParseExact(dateString, "o", CultureInfo.InvariantCulture, DateTimeStyles.None, out dateValue))
{
   Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
  Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

if (DateTime.TryParseExact(dateString, "o", CultureInfo.InvariantCulture, DateTimeStyles.RoundtripKind, out dateValue))
{
   Console.WriteLine("Converted '{0}' to {1} ({2}).", dateString, dateValue, dateValue.Kind);
}
else
{
   Console.WriteLine("'{0}' is not in an acceptable format.", dateString);
}

輸出

' 5/01/2009 8:30 AM' is not in an acceptable format.
Converted ' 5/01/2009 8:30 AM' to 5/1/2009 8:30:00 AM (Unspecified).
Converted '5/01/2009 09:00' to 5/1/2009 9:00:00 AM (Unspecified).
'5/01/2009 09:00' is not in an acceptable format.
Converted '05/01/2009 01:30:42 PM -05:00' to 5/1/2009 11:30:42 AM (Local).
Converted '05/01/2009 01:30:42 PM -05:00' to 5/1/2009 6:30:42 PM (Utc).
Converted '2008-06-11T16:11:20.0904778Z' to 6/11/2008 9:11:20 AM (Local).
Converted '2008-06-11T16:11:20.0904778Z' to 6/11/2008 4:11:20 PM (Utc).